Comparison : Item # SKF00256C, SKF00256C - 2-56 Nuts for PC Boards
Item # SKF00256D, SKF00256D - 2-56 Nuts for PC Boards
Item # SKF00440C, SKF00440C - 4-40 Nuts for PC Boards
Item # SKF00440D, SKF00440D - 4-40 Nuts for PC Boards
Item # SKF00632C, SKF00632C - 6-32 Nuts for PC Boards